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Martin Hope
seg.server.fault
Asked: 2009-08-11 08:22:31 +0800 CST
  • 137

I schedule some tasks using crontab.

What will happen if my computer is shutdown or turned off during the time when cron was scheduled to do something?

Does each missed cron job run after computer is turned on, or are missed jobs for that day ignored? If missed jobs don't resume, is there any way to configure cron such that it runs the missed tasks after the computer is turned back on?

linux ubuntu cron
Martin Hope
seg.server.fault
Asked: 2009-08-10 11:24:49 +0800 CST
  • 0

I want to save/download pdfs from X website and then combined all those pdfs into one, so that it is easy for me to see all of them at once.

What I did,

  1. get pdfs from website

    wget -r -l1 -A.pdf --no-parent http://linktoX

  2. combine pdfs into one

    gs -dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=Combined_`date +%F`.pdf -dBATCH file1.pdf file2.pdf file3.pdf

My question/problem is, I thought of automating whole this in one script, so that I don't have to do this everyday. Here new pdfs are added daily in X.

So, how can I do step 2 above, without giving full list of all the pdfs, i tried doing file*.pdf in step2; but it combined all pdfs in random order.

Next problem is, total number of file*.pdf is not same everyday, sometimes 5 pdfs sometimes 10...but nice thing is it is named in order file1.pdf file2.pdf ...

So, I need some help to complete above step 2, such that all pdfs are combined in order and I dont have to give name of each pdf explicitly

Thanks.

UPDATE: This solved the problem

pdftk `ls -rt kanti*.pdf` cat output Kanti.pdf

I did ls -rt as file1.pdf was downloaded first, and then file2.pdf and so on...just doing ls -t put file20.pdf in the start and file1.pdf in last...

linux pdf
Martin Hope
seg.server.fault
Asked: 2009-07-25 20:03:33 +0800 CST
  • 1

How to change file permission in Linux so that only root user can access/open the file/dir in Linux.

EDIT

Doing 

chmod 600 filename + sudo chown root:root filename

changes it into only root accessible file. But I can see the file content only when I do $ sudo cat file.txt; but when I just click on it, it says file content can't be displayed. So, when I click on it, I want it to show me a dialog box or something, which prompts me to enter root password and then I can open the file. Is this possible ??

How do I change file permission back from root user to normal user A ?

EDIT 2

I can even do 

sudo nautilus .
and then supply root password to open file. But this is all from terminal. I want to open some kind of application/dialog box so that when I click that file/dir as normal user, it will prompt me to enter root password and not just tell me that you dont have proper file permission to open the file. I guess this must be possible, may be with some scripts. Any idea ?

Thanks :)

SOLVED here

linux ubuntu filesystems